HDFS-17452 : DfsRouterAdmin RefreshCallQueue fails when authorization is enabled

[AnanyaSingh2121]

Description of PR
Adding the kerberos principal key for Router refreshCallQueue command

How was this patch tested?
On a federated hadoop cluster kerberos was enabled and the command failed. After locally making the change and testing with hadoop jar the command was successful.

[hadoop-yetus]

💔 -1 overall

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-1 ❌	mvninstall	46m 15s	/branch-mvninstall-root.txt	root in trunk failed.
+1 💚	compile	0m 38s		trunk passed with JDK Ubuntu-11.0.24+8-post-Ubuntu-1ubuntu320.04
+1 💚	compile	0m 37s		trunk passed with JDK Private Build-1.8.0_422-8u422-b05-1~20.04-b05
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			_ Patch Compile Tests _
+1 💚	mvninstall	0m 30s		the patch passed
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+1 💚	javac	0m 32s		the patch passed
+1 💚	compile	0m 29s		the patch passed with JDK Private Build-1.8.0_422-8u422-b05-1~20.04-b05
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+1 💚	unit	30m 27s		hadoop-hdfs-rbf in the patch passed.
+1 💚	asflicense	0m 37s		The patch does not generate ASF License warnings.
		167m 11s

Subsystem	Report/Notes
Docker	ClientAPI=1.44 ServerAPI=1.44 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6982/1/artifact/out/Dockerfile
GITHUB PR	#6982
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
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git revision	trunk / 3c0988a
Default Java	Private Build-1.8.0_422-8u422-b05-1~20.04-b05
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modules	C: hadoop-hdfs-project/hadoop-hdfs-rbf U: hadoop-hdfs-project/hadoop-hdfs-rbf
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[zeekling]

Why i did not found HADOOP_SECURITY_SERVICE_USER_NAME_KEY in CommonConfigurationKeys?

[AnanyaSingh2121]

It is set when the refreshcallqueue is executed. For reference in DFSAdmin we handle it this way

hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java

Line 1875 in b5f8899

conf.set(CommonConfigurationKeys.HADOOP_SECURITY_SERVICE_USER_NAME_KEY,

Also the key is defined in

hadoop/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java

Line 668 in b5f8899

public static final String HADOOP_SECURITY_SERVICE_USER_NAME_KEY =